First, just no. I’m talking about human embryo transplants which even if it were made legal, would be in extreme circumstances. And two, would be just as legal as abortion is now.
There is severe complications with removing a baby before the 32nd week, and fetuses before the 22nd week have a zero percent, not 0.00001%, but 0.000000000000000000000000000000000000000000000000000000000000000000000…% chance outside of the womb. So it would effectively be abortion if the fetus was willfully removed even with the intent to transplant it.
No Republican in their right mind would sign off on that operation being done to a human woman.
It is science fiction because it will never be done to humans.
Both for moral reasons, legal reasons, and scientific impossibility.